The Zookeeper, or just Keeper
It is wellknown that the government has long attempted to control the living dead. Every method from simple baiting to elaborate exoskeletons has met with complete and utter failure. Dr. Michael Cuthbert was one of the men involved in Project Dominance. The goal of Dominance was to develop a cybernetic interface between a handler and a goul in order for the living mind to take control of the walking dead. Cuthbert volunteered to have a Dominance rig grafted to his spinal column. A mobile unit nicknamed a "scarab" was designed to graft itself to the brain of the zombie and act as a relay. Though the project met with early success the brains of the dead were ultimately destroyed by the Scarabs leaving the corpses inert and useless as weapons. Cuthbert left the institute in disgrace, taking a small supply of scarabs with him. It appears that the Scarab was much more compatible with lower level living brains.
Or at least that is what my suspension of disbelief tells me.